Could it be their rights were changed? Or the rights of the folder?

>This VFP app has been running since 2001.
>It runs on a Win server and is accessed remotely by a single user.
>The base folder is Q:\pro6
>Yesterday, an entire folder that holds most of the programs in the app- Q:\pro6\ac\- just disappeared.
>The user can't access the folder.
>What's up?